The actress first saw the Mandalorian character not in the Disney+ series, but at a "basketball game," she hilariously revealed last week -- and now he's following her everywhere.

"I mean, Timmy [Chalamet] and I have seen -- I saw something the other night. But, it just keeps going," Dern told ET's Keltie Knight at the New York City premiere of her new movie, Little Women, on Saturday. "Then I saw him in my coffee today."

While her basketball game encounter with Baby Yoda remains a mystery (Dern played Vice Admiral Amilyn Holdo in Star Wars: The Last Jedi -- but her connection to the character is unknown), the actress did indeed find him in her coffee. She shared the proof on Instagram on Saturday.

"He's just everywhere now. I don't even know what's happening," she said.

Perhaps more exciting than a Baby Yoda sighting for Dern is her reunion with the Little Women cast at Saturday's premiere. The actress plays Marmee March in Greta Gerwig's adaptation of Louisa May Alcott's 1868 classic novel.

"It was incredible. It's a great, great gift and a gorgeous film. And to open Christmas Day and be about voice and what it means to be an artist and revolution, it's really incredible," Dern told ET.

The actress grew extremely close to her co-stars, Saoirse Ronan, Emma Watson, Florence Pugh, Eliza Scanlen, Laura Dern, Chalamet and Meryl Streep -- and counts them among her "best friends."

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"I'm just so lucky," she gushed. "That's what gorgeous about getting to be in a collaborative art where you go off on a journey together, and it's not always like that, but we moved to Massachusetts together for four months. And you know, that's a very bonding experience."

"I love Greta Gerwig and Noah Baumbach," said Dern, who also stars in Baumbach's Marriage Story. Baumbach and Gerwig started dating in 2011; they now have a son together.

"They are my family. To have made a movie with both of them in the same year and consider them both perfect films, of course all I want is for them to be acknowledged and more and more people to get to see their work," Dern continued. "So that's always delicious."